London's black cabs, also known as hackney carriages, are particularly notable on account of the specially constructed vehicles and the extensive training course (The Knowledge) required for fully licensed drivers.

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970

London Taxicab

Throughout the United States there is a mature system of taxicabs. Most US cities have a licensing scheme which restricts the number of taxicabs allowed. These are sometimes called medallions or CPNC (Certificate of Public Necessity and Convenience).